SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fc79233c124983cc3d0822021c7e899fe8d87a120584350d82f7854fae31ef' 
  AND token = '72TzVVNMMj7hAzti/VmvQqTE3GBjUYXZ+QJbBqrWndc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables