SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13be68a14cc4d9d626d6f8e1e2dcf22b6fb2647de53c72e3a375895cbedd6d8' 
  AND token = 'wZ2oJq/j8pX8xGivunhe1LGmbR8/zG7TO4KzHt4qUeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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