MariaDB 10.3

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select version();

version()

10.3.32-MariaDB

/* по широте 1 градус */
-- "точки" (50,120)(51,120)
-- аргумент перевернем Долгота-Широта
SELECT ST_Distance_Sphere(POINT(120, 51 ), POINT(120, 50)) AS LON_Meter;
/* по долготе 1 градус */
-- "точки" (50,121)(51,120)
-- аргумент перевернем Долгота-Широта
SELECT ST_Distance_Sphere(POINT(121, 50 ), POINT(120, 50)) AS LON_Meter;
--
SELECT ST_Distance_Sphere(POINT(125, 55 ), POINT(120, 50)) AS Sphere_Meter;
--
SELECT ST_Distance(POINT(125*111.194, 55*71.474 ), POINT(120*111.194, 50*71.474)) AS Dist_Meter;

LON_Meter

111194.68229846291

LON_Meter

71474.03168200726

Sphere_Meter

650514.6537793479

Dist_Meter

660.9205381889714

-- ОСЛО 
set @x1 = 59.871615914096544; -- широта
set @y1 = 10.732875010123138; -- долгота
-- Стокгольм 
set @x2 = 59.28192441905507; -- широта
set @y2 = 18.082728206254334; -- долгота
-- distance + Koef + 2%
SELECT ST_Distance(POINT(@y1*111194/2, @x1*71474), 
POINT(@y2*111194/2, @x2*71474))*1.02 AS Dist_Meter;
-- distance_sphere
SELECT ST_Distance_Sphere(POINT(@y1, @x1), POINT(@y2, @x2)) AS Sphere_Meter;

Dist_Meter

419013.6222875411

Sphere_Meter

418785.6180850169