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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eba016462b13a5ae5f4bf7f52c210068a5b8bcc0ad153f2a1bf594f4f691b79' 
  AND token = '3wQeX9z1j6Og7lfN7diECj1Vm1sAYCIEpQpn/LlZV0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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