SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b04e8de729413f7f68a4846b2364a57580822c908a5b5f98d5f058cd1c96917' 
  AND token = 'na3v4Fk9zfRgwDCpOk+BKPYJubXR4PKlva8abf1y9+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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