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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2507b9b4ff6dca69f2f9714600058fe44bc557480be1b22c9b0c8fdb61e096f' 
  AND token = 'SimfjdWBEzqJpB1KGsoqDn+Iao1aycwd1BvBQnQJo2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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