Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582f2da1e270ca29b541631f0e926457369f510fe73929133253c862cd319267' 
  AND token = '71fSAndQRY+FLEwvJpVCs/VFug30oick1wq4JFdPPLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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