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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9553d8a3d097a5708d18d47fcc305bcd54360a178bd6c4f12d03c6d002472ebc' 
  AND token = '8BYuTM3u9JwadBdrGa13yzu+3S8AuAn6D6D0+OfTd6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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