SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bcbb31a526b1f4432c2d9ba3f49c0c2513e0e1598e2c70523769021d73152d' 
  AND token = 'ytXamdoLmHma06+BJzvsB/RnT9h+Vq78QAuCWRAWKDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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