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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e27ea57fcb62a6c327967a0504441cc1e4f1ce3f877408ed6c7d0cb9797c03' 
  AND token = 'ULH3024hI3pdoMq18GITrfhd/svU/mrA7SVM5tItEpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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