mySQL query optimisation - multple group by's and UNION ALL -

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i'm having trouble query of mine website enables users search mobile phones. idea when user selects filter - i.e. 'iphone', relevant search critera show.

you can view functionality here http://www.comparephonemarket.co.uk/search.php

the table holds of deals called 'options' , looks this:

model_make  model_name   model_basename   model_colour apple       iphone       iphone 5s        blue apple       iphone       iphone 5s        black apple       iphone       iphone 5s        green

this table of phone deals in criteria users can filter by.

currently it's taking around 7 seconds query indexes on of fields little slow. there around 600k rows.

the sql statement produces options looks this:

select        model_make `element`          options      where1 group model_make union    select       model_basename `element`          options     1 group model_basename union   select       model_colour `element`          options     1 group model_basename;

the resulting table looks like

 element  acer  alcatel  apple  asus  iphone 5c  blue

then in code clause put onto each of options in sub queries returns relevant results filtering.

does know more optimal way of doing query or quicker way of doing entirely?


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