SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a224b95ae13692ddf6a1582dc83be5ab9f8058c273c9813dc77bc135c8ea8f0b' 
  AND token = 'vFC+qMc9jkDqokFVhv/fKs6MuRfUA31xvHG7vkLsZNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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