MYSQL about the distance between two latitude from near sort _mysql

Copy Code code as follows:

SELECT *, (2 * 6378.137* ASIN (SQRT) (POW (SIN (PI () * (111.86141967773438-lat)/360), 2) +cos (pi () *33.07078170776367/180) * COS (Lat * pi ()/180) *pow (SIN (PI () * (33.07078170776367-LNG)/360), 2))) as Juli from ' area '
ORDER BY Juli ASC limit 0,20

That's pretty much it, make a note.
But I think this is still very slow, because my coordinates are obtained through Baidu, my idea is to be able to turn the plane coordinates better, so that better calculation