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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa2467ecf70e900bd79053d11efb8ef36fbfea69206038192678caa4e7f3510' 
  AND token = 'N2MmyrhOmU8zbB0swcOGX5xQVf9Tcw+Y/NejVvXOF2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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