SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0f0595b219a7f26ef9cabd0861f50240650e7c498e43dde9f45e2fe6d6d653' 
  AND token = 'g9okLRHKgPkYIZtvmKnTpfYMu6LuFEmW/mBf1jU+ZRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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