SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adb22cadd162230b2170d5b94539ab9107f6b5a1d7a168f7f7b385dacf9fc33' 
  AND token = 'xrKeiHShQ/sYNueCGrvD51FM+U4Tjo+nzGPW2DorOsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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