SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331de1f599487b59d05c858623d802549ad30b2650a9524938fc561cd68b3f1f' 
  AND token = 'rncfECA5D1GK0Zw2Dj1Xgdz+LgU45E9t/hn5NWmBMus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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