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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719f99fc1932d486d4ce7ebf4ecaa636805b971bee76a238747f510cf5b254c5' 
  AND token = 'JwyDTwrJGMZIMktfAHKJQ7cQr3v1rkK8NlP1AJan3Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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