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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af96bc05d4b3f7407d0982cdb7a44c53b2c6024941c0b2cf6d9567bc16e329eb' 
  AND token = 'MEdPB6WW560XeVG2Wtd9/iE63nSuldbyjZvoiyIM4Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}