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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a695c7360fa74903fb342321cf90d1be0d8b8555beae4b5d0821a1653935d25' 
  AND token = 'rDjnqtDDXtGDBW0XsUMaJMztLhwaodMOZlgDmhObmzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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