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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559639fac8700c9c404f3d34e171a37947c00d91b3eeccd3773c75eaeb0c7c4d' 
  AND token = 'Gj5tGiYnYMPocF0yuPDlWFNNg7khTpXOOLGfNksWqQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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