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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1cb0b47c16b8cffb8ac790c1cdc7a7ce3d09879173896c51def4951ee2f5a7' 
  AND token = 'tHr7U0CAZhd0qLBA2cgVhHV8hJL9LQm74u8K7klciig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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