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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d8d110286c3a14b379ae00f43ae222be7d41a91c06101b1975d7c6ff1e1d10' 
  AND token = 'x+TkmxHrldKiRARRVdaJutzbLGF06YVCRVvn9/3XEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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