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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6542e39921426f8d5e0aa44e72ad0f4410ceafea448bc81bd072572e6ae5b429' 
  AND token = 'IgvOvelVjAEXI3TCkiVIPz4qEy/nKYacLBNHSXinAdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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