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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a7ca1b656638765c0a9c80f2eb1e37dbb3a43e1a3e78be90f3bc645025a338' 
  AND token = 'oObv7VcSLl97Jz/TTrpuGkdp9SXbPZZz7eZ0rqcVeBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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