SELECT *
FROM Point
WHERE
6378137
*
(
2
*
ATAN2(
SQRT(
SIN((Point.Lat  59.332526) * PI() / 180)
*
SIN((Point.Lat  59.332526) * PI() / 180)
+
COS((59.332526 * PI() / 180))
*
COS((Point.Lat * PI() / 180))
*
SIN(((Point.Lng  18.064091) * PI() / 180) / 2)
*
SIN(((Point.Lng  18.064091) * PI() / 180) / 2)
),
SQRT(
1

(
SIN((Point.Lat  59.332526) * PI() / 180)
*
SIN((Point.Lat  59.332526) * PI() / 180)
+
COS((59.332526 * PI() / 180))
*
COS((Point.Lat * PI() / 180))
*
SIN(((Point.Lng  18.064091) * PI() / 180) / 2)
*
SIN(((Point.Lng  18.064091) * PI() / 180) / 2)
)
)
)
) <= 300  300 meters
In the above example I use the LatLng position of central Stockholm (59.332526, 18.064091) as the base point and select all points within a 300meter radius from it. Of course this can be simplified, but you get the Point.