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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e4a61ffec6c50db6e5b9414efe209d11c990dd8bbdccd9ad03f6d994399354' 
  AND token = 'C80wMZM3n7eERlkN6jpNpb2vrrUdecf05/t+L8OItfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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