SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55b30ef762b7f4117ca2189cbfdc24982944fd6aeca679e1daa8a95648800b0' 
  AND token = 'haH8GKkBfgfqtjW/kgWggodsUvZqTbhO20Pupg7TzmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}