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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac00364232b2773eb35a0fc57abc0ed49772d4e7accb9349ac40d7774a003819' 
  AND token = 'ElC7HIzaKkY67afrC772mOCHxXi2P57PkmiUhmxwEHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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