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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1436b7a70f7c2d900c9135c0ce30f72e3d8e4bdd68d2f101eb08c8fe4df305a7' 
  AND token = 'yIh+zrBnJe4ug+XCGRgqA22kdl9JpRVn92qqUQrcrwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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