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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9938691ceb2365cdbc24583f90ac88a9a5f68c4f843e1e4a110d6dbbf181612c' 
  AND token = '3iibNl4os+aGFoSrWa88uea/EHSNFIU8SoYp2c/pZBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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