SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908e5a19c9dc0fb898595e543deb7ec9a98f19ad616b3971f0b307112f7896fb' 
  AND token = '0LHvF1b4ApCFwPlfPnLYmwMJXB7jOpqq7S5OgGgrRQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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