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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c5897150222683774431e80b7cab45b5f925de8b36f1fba3c5c67e5be22e86' 
  AND token = 'Sjzggg1FyP+IbeceIwyc8ZsQaSTfRnIdABeTXIpqSaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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