SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c0aaa25c12848bea6b31f76f0a766cd6b15dbc8493c8ecebf855c3ff890168' 
  AND token = 'f4Du1VhLrVEtmNYj0kqAUoQKhRpCq73gLc6O/+zXLXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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