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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1fa644e2249b021eeae2a76c86343ccef71fe16774525af0509b31c175bd3f' 
  AND token = 'UNhc63zE5W7WQFSKVc2lhARY45k6hNLHwNPJMZm3cHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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