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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f679dbc7ae8801f323ac31e9a16ec01ed139231cc5d5b527977c7c166f4f5f' 
  AND token = '/GJyeieGVrvPBETwn7NE0zopnFJQlMiTS1OHOzHW5uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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