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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44981c6513fc9d08d585d8791a04f8b5d3a33baa72bd926526810ad2139517d' 
  AND token = 'XaVLVUOkuegzAHnFqfAGzHBiyDRu59XhRMPL00r0TN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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