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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dcff31464c597fa9ff6b49bd7b016b8c97023e9a114d315f614c0420304c7d' 
  AND token = 'k1tuRcpaJ1EYKkDR0UEVlLw8rnuDj8ckiACOunvjJ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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