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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c519880867a4872f8f3fc2bd5cc3f5c4e9b9f9af1596cac7f242ce7e6b580bb9' 
  AND token = '9CR7m/xYu7f1PKvW6W0TdNfKPCkW6nnlRZHq+LEAEz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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