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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91887879c9bd441a80f0d973c4517eb068a7663f561f0911ace12d86dd95824' 
  AND token = 'X+efD+vGuam3ROUU+uIkplQegTGtCDGhP395xt/ds/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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