> Do you guys know if I can parse LatLng on the server side?

I'm not sure what you mean.  If you mean, can a non-javascript
language make direct use of a javascript object like GLatLng -
probably not.  But it's very easy to extract the lat and long as
numerics.

> Do you guys know if there is a method to query the closest point data
> from mysql efficiently?

MySQL spatial extensions-
   http://dev.mysql.com/doc/refman/5.0/en/spatial-extensions.html

However, even without the extension, if you store lat and long as
numeric columns it becomes trivially easy to search by a bounding box
using less-than, and, more-than.   If you must have data by a true
radius, you still have to calculate as you do now - but only on a
small subset of "possibles" from the box, not the full dataset.
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