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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc769a356cb1cd84e98380ace3416df5868b8315085c203e635cb3c7c7efe6c' 
  AND token = 'ivkAMoZRHSOCTWc5OPt7EKM1ldt032Yi84xB0HzpUCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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