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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56a3ce97d33ffa5757609a9cfd5d2ca0ea6704cdfcff8e2964488b3ae049b63' 
  AND token = 'hu1YfNEULzgAZHSHBUXqzdz5mHd9slXKF497lqtRZTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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