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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4f03369024bf98bce5bb1b73888bd1347ace6c1918ceefa1ade03d1486873d' 
  AND token = 'suFxYnnCtx/HnkREaPKcRYmCJFnKYmAYHX+ySEOiArU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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