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Lives & boosters are not stored to king server. If you do any of these your all lives will be gone
1. Deleting app data or Caches
2. Logout, Login
3.Uninstall app
Use lives whenever you have, store maximum 10 lives in your phone, not more.
Hi and Welcome to the King Community
If you update Facebook, change your profile, reinstall the Facebook app or even update its app software, those Facebook notifications may get lost, as they've been delivered and cleared from the queue. While it is possible to store in-game messages from your friends, due to these factors outside our control, we cannot guarantee that they will remain on your device indefinitely.
Lives can also be lost through an update to the game, your own device or by restarting your device, which clears a certain amount of memory, depending on your device
Check also the page here about the Lives.