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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982a83f74083e5e3eff1989506eba8a5ab8801a08ccdac3849ba3ee90f83ddf9' 
  AND token = 'Li5Ay1iLPf3eAct7jsy457+oMxIICZm3Zyx55Xs+c6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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