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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3575154f5b33606ab8c1f2edcc6a33ed985aff6e9aa36ff99b8d0979a0ef48e' 
  AND token = 'NB0ZFummzYP4pDo+qdm7mFab2zh5MBB8EUvcQM7DZZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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