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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92616b80053444477a171c3ce82cab6b68ddaaf34921818d72f94828567708cb' 
  AND token = 'ZxWXoN4/g7nSbPWZsqNNxtLbyR1rvHDTo6JAbAjb0HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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