SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e9cacf47561a50dca1a692b7d530893362b9d87703865d613ef21291ba23d6' 
  AND token = '/FKFAP5h5c+lrNfIZViUyX4ZB8R4ZKofJA/bYAJzjAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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