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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301e565cfcee169ca7e07fa31442dd8532e40ef8b4bd41e7df9d33a663fd48f6' 
  AND token = '1MvyWdM8FBrPOs2+h15ih+uBhzCRGDFHQGkHFjma5hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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