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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f740bfb1cf9fef92fd0270eb33b869b84fdb1c9cae62a3ac6bef4e5bcef756' 
  AND token = 'rgKcB6v61EAd/V8PdfWGCzXFYU75ziEGJsv8Ce4Et38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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