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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21025cf71be2621f66aca53d1d458db0de6cf95c9ffad74c96740cbaec35157e' 
  AND token = '+SCEF5hVCgXX6g4bYabY9iDTfG+dkG6b2TuUI+Xd4QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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