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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46f7b923faec7b6dc1f9d82af2b6d6b21aaeac072a4efdb1af72c50520f4776' 
  AND token = 'qvayGH1yNEyAJOlJQFoYlg5EMH/W+WdzFkoeqYA7RFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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