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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe20429c80d2d89ab880068bb6147ae73ec9e9a3d4fb5dc84d376d0a9329df8' 
  AND token = 'm0jFbI/YhFtyh2REJlvfkU2ZntmVxK532N/x+Vsk6XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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