SQLでDistinctをExistに置き換えたい

検索結果のクエリ速度を上げるため、DistinctをExistに置き換えたいのですが、自分には複雑でうまく置き換えができませんでした。
2つあるのですが、下記となります。
尚、計測したところ合計で約2.5秒ほどかかっています。(wp_postmetaは30万件)

1つ目

SELECT DISTINCT
   PM.meta_value AS madorisu,
   PM_2.meta_value AS madorisyurui 
FROM
   (
       (
           (
                wp_posts AS P 
                INNER JOIN wp_postmeta AS PM 
                ON P.ID = PM.post_id
           ) 
           INNER JOIN wp_postmeta AS PM_1
           ON P.ID = PM_1.post_id
       ) 
       INNER JOIN wp_postmeta AS PM_2
       ON P.ID = PM_2.post_id
   )
WHERE
    P.post_status = 'publish' 
AND P.post_password = '' 
AND P.post_type = 'fudo' 
AND PM_1.meta_key = 'bukkenshubetsu' 
AND CAST( PM_1.meta_value AS SIGNED ) > 3000 
AND PM.meta_key = 'madorisu' 
AND PM_2.meta_key = 'madorisyurui'

2つ目

SELECT DISTINCT
   DTR.rosen_name,
   DTR.rosen_id,
   DTS.station_name,
   DTS.station_id,
   DTS.station_ranking  
FROM
   (
       (
           (
               (
                   (
                       (
                           wp_posts AS P
                        )
                        INNER JOIN wp_postmeta AS PM 
                        ON P.ID = PM.post_id
                    )  
                    INNER JOIN wp_postmeta AS PM_1
                    ON P.ID = PM_1.post_id
                )
                INNER JOIN wp_postmeta AS PM_2 
                ON P.ID = PM_2.post_id
            )  
            INNER JOIN wp_train_rosen AS DTR
            ON CAST( PM_1.meta_value AS SIGNED ) = DTR.rosen_id
        )  
        INNER JOIN wp_train_station AS DTS
        ON  DTS.rosen_id = DTR.rosen_id 
        AND CAST( PM.meta_value AS SIGNED ) = DTS.station_id
   )
WHERE
    (
        P.post_status = 'publish'  
        AND P.post_password = ''  
        AND P.post_type = 'fudo'  
        AND PM.meta_key = 'koutsueki1'  
        AND PM_1.meta_key = 'koutsurosen1'  
        AND PM_2.meta_key = 'bukkenshubetsu'  
        AND PM_2.meta_value > 3000 
    )
OR  (
        P.post_status = 'publish'  
        AND P.post_password = ''  
        AND P.post_type = 'fudo'  
        AND PM.meta_key = 'koutsueki2'  
        AND PM_1.meta_key = 'koutsurosen2'  
        AND PM_2.meta_key = 'bukkenshubetsu'  
        AND PM_2.meta_value > 3000 
    )

どうぞよろしくお願いいたします。

post_metaの構造ですが、ワードプレス標準のものをそのまま利用しており下記となっています。

【post_metaテーブル】（１つ目の参考に抜粋しました。meta_idがプライマリとなります。）

| meta_id | post_id | meta_key | meta_value |
| 100000 | 3120 | mardorisu | 4 |
| 100001 | 3120 | mardorisyurui | 10 |

【期待する結果】（１つ目の抜粋）

| mardorisu | mardorisyurui |
| 1 | 50 |
| 2 | 50 |
| 1 | 10 |
| 1 | 55 |
| 3 | 30 |