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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd4a36289fe831dd139ea2461704329cdcbc937c1b11efcf54f19ab633c6193' 
  AND token = 'l2JByrUtbyoUlAqWl6zsCnsCiBKr/+8YjFj0wFp5L3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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