SELECT
cod,name_rus, country_id, region_id, rayon_rus, (abs((lon - 91.2)*(lon - 91.2)) + ABS((lat - 75.633)*(lat - 75.633)) ) as distance
FROM city_guru
WHERE cod < 100000000 and
(abs((lon - 91.2)*(lon - 91.2)) + ABS((lat - 75.633)*(lat - 75.633)) )<10 and (abs((lon - 91.2)*(lon - 91.2)) + ABS((lat - 75.633)*(lat - 75.633)) ) >0.000001
ORDER BY `distance` ASC limit 1