SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ff7f9d448bb5bcd03422865316d4ad31577132f29605509be892458b1a601c' 
  AND token = 'lgIPLzjFfTlh/Vbg+eZ0WIj5souC5sXlopK0zRJOLpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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