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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daf406880211c3ac2d19f50164cfa8da6b72f85033101902399e92789f208d3' 
  AND token = 'WtlrMZOIR3HFgN3C9CZSx3VcoUMsh4mh7wqZRk1WGYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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