[Solved] Understanding MySQL log_queries_not_using_indexes behavior

How to optimize this SQL query?

In case you have your own slow SQL query, you can optimize it automatically here.

For the query above, the following recommendations will be helpful as part of the SQL tuning process.
You'll find 3 sections below:

  1. Description of the steps you can take to speed up the query.
  2. The optimal indexes for this query, which you can copy and create in your database.
  3. An automatically re-written query you can copy and execute in your database.
The optimization process and recommendations:
  1. Avoid Selecting Unnecessary Columns (query line: 2): Avoid selecting all columns with the '*' wildcard, unless you intend to use them all. Selecting redundant columns may result in unnecessary performance degradation.
The optimized query:
SELECT
        * 
    FROM
        user_rel 
    WHERE
        (
            user_rel.f = '5837be9dc34f747dbd7ba6c7' 
            AND user_rel.t = '5837be9dc34f747dbd7ba6ca'
        ) 
        OR (
            user_rel.f = '5837be9dc34f747dbd7ba6ca' 
            AND user_rel.t = '5837be9dc34f747dbd7ba6c7'
        ) LIMIT 2

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* original question posted on StackOverflow here.