title: django mysql force usage of index
body: <p>I'm using django orm and mysql.
  From some reason mysql is using the wrong index.
  I want to manually override the index used.
  I saw that the django team decided from cross platform reason to prevent usage of with_hints extension that would force an index.
  Does anyone have any kind if solution \ proposal how I could get mysql to use the correct index then through django?</p>
  
  <p>Thanks</p>