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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcd3519230b041cd3665d85fec9347afe3bb2ef487bb495ef8529bf48759710' 
  AND token = 'xWf5ZK7nFGlY2h5rIHr2+jURoyIFMfZZx06ubdYLvjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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