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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa7f89c7fb310f582da56ce38883fbaa1fd98d2ed9bd26a63a724119ba87a3c' 
  AND token = 'E8TmO9t0MNYJKgdaezjTD5MYsM5Z9WgyUuY0c9YZQzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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