Redis Lua "where" function

myscript.lua

local keys = redis.call('hgetall',KEYS[1])
local i = ARGV[1]

local key
local value

for k,v in ipairs(keys) do
	if k % 2 == 0 then
		value = v
	else
		key = v
	end

	if value == i then
		return key
	end
	-- redis.log(redis.LOG_WARNING, k,v)
end