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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabb60897f70841cbebfea4ff8c54ff8de4012c4021612fbf87cef90c6b3e85a' 
  AND token = '0ZD7Y2JAblN+ucHmbOU95O0ZTu7O7+ZoEXN645xhGcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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