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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d505255918e8850df1a1817e5c53f0fb6c39d312522af70e6d057bebed97928' 
  AND token = 'FgZM44GVyqryiOKTmPlUg6q1HpR33ye6uguomes2VcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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