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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee519fbd67fb20cccf9be278e170cf97a816ea3e977df5dd38d263ec47f9e7e2' 
  AND token = '8m/lqhqKa/fKnNj7YPbKNRWwq1xi1UHrLoUZgtEkbdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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