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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ef613a5ea04c67819e780ed6929bc3ec18379d91f4917ab849f95ef06cae1c' 
  AND token = 'Ua/fxzHyPcOgXti3Qy3D+cDV0GS+TF3bmfSXK1Dnjnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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