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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274d9a5f0c226344e88f0aac074f46f9e6f2905d1c0208e7e94e6eb1c7e7cd9c' 
  AND token = 'iO13lm218oAve1SElltxn5q9hyie4l6/1xMtLjuQe9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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