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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1628e7592d660b4976e5fe5509e66201859d15bb4e05aa4ab5c3b1bd6fc9fca4' 
  AND token = '7+iDv1thqAovt4yPLKJSNXAGWEoHGx1L+qsqZlg4bzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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