Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a514488df667a490af5f921c3e39f01e611cfeb4cc6ae22cc2fca7e3bf8dcd' 
  AND token = 'ySzegZfnKoTQKn/nTF7oy/c5ehbfRzG5mdYihsU+1bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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