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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cf18e6a561f1fd0eef31f76f7115685be64bb73d83cf4f42319f2a37e8c385' 
  AND token = '1sKEVY0AQizbRSQazna4bs8iFRakoYj0bhVs7wCd6KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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